First release

src/spec.h

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+/******************************************************************************
+ *
+ *  Copyright 2022 Google LLC
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+/**
+ * LC3 - Spectral coefficients encoding/decoding
+ *
+ * Reference : Low Complexity Communication Codec (LC3)
+ *             Bluetooth Specification v1.0
+ */
+
+#ifndef __LC3_SPEC_H
+#define __LC3_SPEC_H
+
+#include "common.h"
+#include "tables.h"
+#include "bwdet.h"
+#include "ltpf.h"
+#include "tns.h"
+#include "sns.h"
+
+
+/**
+ * Spectral quantization side data
+ */
+typedef struct lc3_spec_side {
+    int g_idx, nq;
+    bool lsb_mode;
+} lc3_spec_side_t;
+
+
+/* ----------------------------------------------------------------------------
+ *  Encoding
+ * -------------------------------------------------------------------------- */
+
+/**
+ * Spectrum analysis
+ * dt, sr, nbytes  Duration, samplerate and size of the frame
+ * pitch, tns      Pitch present indication and TNS bistream data
+ * spec            Context of analysis
+ * x               Spectral coefficients, scaled as output
+ * xq, side        Return quantization data
+ */
+void lc3_spec_analyze(enum lc3_dt dt, enum lc3_srate sr,
+    int nbytes, bool pitch, const lc3_tns_data_t *tns,
+    lc3_spec_analysis_t *spec, float *x, int16_t *xq, lc3_spec_side_t *side);
+
+/**
+ * Put spectral quantization side data
+ * bits            Bitstream context
+ * dt, sr          Duration and samplerate of the frame
+ * side            Spectral quantization side data
+ */
+void lc3_spec_put_side(lc3_bits_t *bits,
+    enum lc3_dt dt, enum lc3_srate sr, const lc3_spec_side_t *side);
+
+/**
+ * Encode spectral coefficients
+ * bits            Bitstream context
+ * dt, sr, bw      Duration, samplerate, bandwidth
+ * nbytes          and size of the frame
+ * xq, side        Quantization data
+ * x               Scaled spectral coefficients
+ */
+void lc3_spec_encode(lc3_bits_t *bits,
+    enum lc3_dt dt, enum lc3_srate sr, enum lc3_bandwidth bw, int nbytes,
+    const int16_t *xq, const lc3_spec_side_t *side, const float *x);
+
+
+/* ----------------------------------------------------------------------------
+ *  Decoding
+ * -------------------------------------------------------------------------- */
+
+/**
+ * Get spectral quantization side data
+ * bits            Bitstream context
+ * dt, sr          Duration and samplerate of the frame
+ * side            Return quantization side data
+ * return          0: Ok  -1: Invalid bandwidth indication
+ */
+int lc3_spec_get_side(lc3_bits_t *bits,
+    enum lc3_dt dt, enum lc3_srate sr, lc3_spec_side_t *side);
+
+/**
+ * Decode spectral coefficients
+ * bits            Bitstream context
+ * dt, sr, bw      Duration, samplerate, bandwidth
+ * nbytes          and size of the frame
+ * side            Quantization side data
+ * x               Spectral coefficients
+ * return          0: Ok  -1: Invalid bitstream data
+ */
+int lc3_spec_decode(lc3_bits_t *bits, enum lc3_dt dt, enum lc3_srate sr,
+    enum lc3_bandwidth bw, int nbytes, const lc3_spec_side_t *side, float *x);
+
+
+#endif /* __LC3_SPEC_H */